Battery monitoring system
First Claim
1. A method of monitoring a backup battery for a magnetic bearing centrifugal compressor, the method comprising:
- establishing a threshold voltage for a battery level of the backup battery;
monitoring an actual voltage of the backup battery;
comparing the actual voltage of the backup battery to the threshold voltage;
initiating a shutdown sequence of the magnetic bearing centrifugal compressor if the magnetic bearing centrifugal compressor is operating and the actual voltage is below the threshold voltage for a defined period of time;
preventing the magnetic bearing centrifugal compressor from starting if the magnetic bearing centrifugal compressor is not operating and the actual voltage is below the threshold voltage; and
allowing the magnetic bearing centrifugal compressor to continue operation or begin operation if the actual voltage is greater than the threshold voltage.
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Accused Products
Abstract
A method of monitoring a backup battery for a magnetic bearing centrifugal compressor. The method includes: establishing threshold voltage values applicable to the battery backup battery level; monitoring the actual voltage of the battery backup; comparing the actual voltage of the battery backup to the threshold voltage; initiating a soft shutdown of the magnetic bearing centrifugal compressor if the magnetic bearing centrifugal compressor is operating and the actual voltage is below the threshold voltage for a defined period of time; preventing the magnetic bearing centrifugal compressor from starting if the magnetic bearing centrifugal compressor is not operating and the actual voltage is below the threshold voltage; or allowing the magnetic bearing centrifugal compressor to continue operation or begin operation if the actual voltage is greater than the threshold voltage.
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Citations
19 Claims
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1. A method of monitoring a backup battery for a magnetic bearing centrifugal compressor, the method comprising:
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establishing a threshold voltage for a battery level of the backup battery; monitoring an actual voltage of the backup battery; comparing the actual voltage of the backup battery to the threshold voltage; initiating a shutdown sequence of the magnetic bearing centrifugal compressor if the magnetic bearing centrifugal compressor is operating and the actual voltage is below the threshold voltage for a defined period of time; preventing the magnetic bearing centrifugal compressor from starting if the magnetic bearing centrifugal compressor is not operating and the actual voltage is below the threshold voltage; and allowing the magnetic bearing centrifugal compressor to continue operation or begin operation if the actual voltage is greater than the threshold voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of monitoring a backup battery for a magnetic bearing centrifugal compressor, the method comprising:
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monitoring voltage amplitude over a period of time at an input to an uninterruptible power source of the magnetic bearing centrifugal compressor to determine if the backup battery is connected or disconnected to the magnetic bearing centrifugal compressor, whereby if a difference between a minimum voltage and a maximum voltage is greater than a threshold variance, an amplitude sample is recorded and saved; collecting a plurality of amplitude samples comprising the amplitude sample; displaying a fault if the threshold variance is exceeded for a defined amount of consecutive samples of the plurality of amplitude samples indicating the backup battery is disconnected; initiating a shutdown sequence of the magnetic bearing centrifugal compressor if the magnetic bearing centrifugal compressor is operating and the threshold variance is exceeded for the defined amount of consecutive samples; preventing the magnetic bearing centrifugal compressor from starting if the magnetic bearing centrifugal compressor is not operating and the threshold variance is exceeded for the defined amount of consecutive samples; and allowing the magnetic bearing centrifugal compressor to continue operation or begin operation if the threshold variance is not exceeded for the defined amount of consecutive samples. - View Dependent Claims (16, 17, 18)
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19. A method of monitoring a backup battery for a magnetic bearing centrifugal compressor, the method comprising:
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monitoring a number of times bearings drop a shaft of the magnetic bearing centrifugal compressor while the shaft is rotating during a power loss event; counting the number of times the bearings drop the shaft of the magnetic bearing centrifugal compressor; comparing the counted number of times the bearings drop the shaft of the magnetic bearing centrifugal compressor to a defined threshold number of times the bearings drop the shaft of the magnetic bearing centrifugal compressor; displaying a fault if the counted number of times the bearings drop the shaft of the magnetic bearing centrifugal compressor is greater than the defined threshold; and preventing the magnetic bearing centrifugal compressor from starting until the fault is cleared.
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Specification